Author(s)

Berhanu F. Alemaw^*, Ron T. Chaoka

Department of Geology, University of Botswana, Gaborone, Botswana.

Most planned developments in a catchment for control of excess water using a culvert, bridge or dam spillway are located at a site in a stream where there are no discharge measurements. Even though, for gauged catchments a number of established flood frequency models and rainfall-runoff models do exist, for ungauged catchments mostly regional flood frequency and event-based rainfall-runoff models are used, which depend on regional parameters. In this paper, a regional approach for design floods is presented and risk implication for design of drainage structures assessed. A case study in light of the above has been considered at four ungauged sites in the Limpopo Drainage Basin in north-eastern Botswana.

Ungauged Catchments, Drainage Structures, Dams, Design Flood, Risk Assessment

Alemaw, B. and Chaoka, R. (2016) Regional Design Storm and Flood Modelling—Risk Implications in Ungauged Catchments. Journal of Water Resource and Protection, 8, 1211-1221. doi: 10.4236/jwarp.2016.813093.